Charon is a moon of ______________
a. Earth
b. Venus
c. Neptune
d. Mars
e. Pluto
e
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A ball is subjected to a pressure of 25.0 atmospheres. The un-squeezed diameter of the ball is 4.00 cm. The squeezed diameter of the ball is 3.99 cm. The bulk strain on the ball is
a. 
b. 
c. 
d. 
e. 
Tidal forces are important to the Algol system today but were not important when both stars were still on the main sequence. Why not?
A) Main-sequence stars in a system like the Algol system are small compared to their physical separation. B) Main-sequence stars are too big to be affected by tidal forces. C) Main-sequence stars are too massive to be affected by tidal forces. D) Main-sequence stars are unaffected by tidally induced mass transfer.
Supermassive galaxies are found at the core of rich galaxy clusters
Indicate whether the statement is true or false
In twice the time, an object will fall
A) 16 times as far. B) 12 times as far. C) four times as far. D) twice as far. E) eight times as far.